Keysight Technologies N2893A Manual de usuario

Keysight N2893A

100 MHz Current Probe

User’s

Guide

2 N2893A 100 MHz Current Probe User’s Guide

Notices

2016, 2017, 2018

No part of this manual may be reproduced in

any form or by any means (including elec-

tronic storage and retrieval or translation into

a foreign language) without prior agreement

and written consent from Keysight Technolo-

gies, Inc. as governed by United States and

international copyright laws.

Manual Part Number

N2893-97004

Edition

August 2018

Published by:

Keysight Technologies, Inc.

1400 Fountaingrove Parkway

Santa Rosa, CA, 95403

Warranty

The material contained in this document is

provided “as is,” and is subject to being

changed, without notice, in future editions.

Further, to the maximum extent permitted

by applicable law, Keysight disclaims all

warranties, either express or implied, with

regard to this manual and any information

contained herein, including but not limited

to the implied warranties of merchantability

and fitness for a particular purpose. Key-

sight shall not be liable for errors or for inci-

dental or consequential damages in

connection with the furnishing, use, or per-

formance of this document or of any infor-

mation contained herein. Should Keysight

and the user have a separate written agree-

ment with warranty terms covering the

material in this document that conflict with

these terms, the warranty terms in the sepa-

rate agreement shall control.

Technology Licenses

The hardware and/or software described in

this document are furnished under a license

and may be used or copied only in accor-

dance with the terms of such license.

U.S. Government Rights

The Software is "commercial computer soft-

ware," as defined by Federal Acquisition Reg-

ulation ("FAR") 2.101. Pursuant to FAR

12.212 and 27.405-3 and Department of

Defense FAR Supplement ("DFARS")

227.7202, the U.S. government acquires

commercial computer software under the

same terms by which the software is custom-

arily provided to the public. Accordingly,

Keysight provides the Software to U.S. gov-

ernment customers under its standard com-

mercial license, which is embodied in its End

User License Agreement (EULA), a copy of

which can be found at http://www.key-

sight.com/find/sweula. The license set

forth in the EULA represents the exclusive

authority by which the U.S. government may

use, modify, distribute, or disclose the Soft-

ware. The EULA and the license set forth

therein, does not require or permit, among

other things, that Keysight: (1) Furnish tech-

nical information related to commercial com-

puter software or commercial computer

software documentation that is not custom-

arily provided to the public; or (2) Relinquish

to, or otherwise provide, the government

rights in excess of these rights customarily

provided to the public to use, modify, repro-

duce, release, perform, display, or disclose

commercial computer software or commer-

cial computer software documentation. No

additional government requirements beyond

those set forth in the EULA shall apply, except

to the extent that those terms, rights, or

licenses are explicitly required from all pro-

viders of commercial computer software pur-

suant to the FAR and the DFARS and are set

forth specifically in writing elsewhere in the

EULA. Keysight shall be under no obligation

to update, revise or otherwise modify the

Software. With respect to any technical data

as defined by FAR 2.101, pursuant to FAR

12.211 and 27.404.2 and DFARS 227.7102,

the U.S. government acquires no greater than

Limited Rights as defined in FAR 27.401 or

DFAR 227.7103-5 (c), as applicable in any

technical data.

Safety Notices

CAUTION

A CAUTION notice denotes a hazard. It

calls attention to an operating proce-

dure, practice, or the like that, if not

correctly performed or adhered to, could

result in damage to the product or loss

of important data. Do not proceed

beyond a CAUTION notice until the indi-

cated conditions are fully understood

and met.

WARNING

A WARNING notice denotes a hazard. It

calls attention to an operating proce-

dure, practice, or the like that, if not

correctly performed or adhered to,

could result in personal injury or death.

Do not proceed beyond a WARNING

notice until the indicated conditions

are fully understood and met.

DANGER

A DANGER notice that incorrect opera-

tion presents extreme danger of acci-

dent resulting in death or serious injury

to the user.

N2893A 100 MHz Current Probe User’s Guide 3

Contents

Introduction / 5

Features / 5

Scope Compatibility / 5

Inspecting the Probe / 6

Cleaning the Probe / 6

Safety Information / 7

N2893A Components / 9

Using the Probe / 11

Making Measurements / 11

Obtaining the Best Measurement Accuracy / 12

Demagnetization and Zero Offset / 14

Protecting the Probe Against Damage Resulting from Excessive

Input / 15

Built-in Safety Function / 15

Performance Verification for N2893A / 17

Procedure / 17

Characteristics and Specifications / 21

Plots / 24

Product Markings and Labels / 26

Service Strategy / 27

To return the Probe to Keysight Technologies for Service / 27

Index

4 N2893A 100 MHz Current Probe User’s Guide

Contents

Keysight N2893A 100 MHz Current Probe

User’s Guide

Introduction

The N2893A is a wide-band, DC to 100 MHz, active current probe. The probe features low

noise and low circuit insertion loss. The probe has the following operating regions that

provide a wide, flat frequency response.

- In the DC to low frequency AC region, the probe operation is based on the negative

feedback system that includes the thin film Hall element as a detector.

- In the high frequency region, the probe operates as a current transformer.

The N2893A is ideal for acquiring high transient time signals such as those found in motor

controllers, in switching power supplies, and in current amplifiers driving inductive loads.

The probe connects to the InfiniiVision and Infiniium oscilloscopes with 1 MΩAutoProbe

interface. The oscilloscope’s AutoProbe interface provides the probe power, probe offset,

and auto configuration of probe type and attenuation setting thereby making the current

measurements as simple as those made with active voltage probes.

To use this probe effectively and to ensure a long operational life, read this user’s guide

carefully and retain it for future reference.

Features

- Highly accurate current detection

- Split-core construction allows an easy circuit connection

- Wide bandwidth - DC to 100 MHz

- Connects directly to InfiniiVision and Infiniium oscilloscopes with 1 MΩAutoProbe

interface

- Auto degauss and offset elimination

- Auto activation of the built-in safety feature if the input current exceeds the rated

continuous maximum to prevent damage resulting from overloading.

Scope Compatibility

- 3000 X-Series oscilloscopes

- 5000, 6000 (except 100 MHz models), and 7000 Series oscilloscopes with software

version 6.10 or higher

- 9000A Series with software version 3.0 or higher

- 90000 X-Series with the N5449A adapter

6 N2893A 100 MHz Current Probe User’s Guide

N2893A Probe

Inspecting the Probe

- Inspect the shipping container for damage.

- Keep the damaged shipping container or cushioning material until the contents of the

shipment have been checked for completeness and the probe has been checked

mechanically and electrically.

- Check the accessories. If the contents are incomplete or damaged, notify your Keysight

Technologies Sales Office.

- Inspect the probe. If there is mechanical damage or defect, or if the probe does not

operate properly or pass calibration tests, notify your Keysight Technologies Sales

Office.

- If the shipping container is damaged, or the cushioning materials show signs of stress,

notify the carrier as well as your Keysight Technologies Sales Office. Keep the shipping

materials for the carrier’s inspection. The Keysight Technologies office will arrange for

repair or replacement at Keysight Technologies’ option without waiting for claim

settlement.

Cleaning the Probe

If the probe requires cleaning, disconnect it from the oscilloscope and gently clean the

external surface of the probe with a soft cloth dampened with a mild soap and water

solution.

Cleaning the Sensor Head

The presence of foreign substances such as dust on the mating surfaces of the probe’s

sensor head can cause acoustic resonance and degraded measurements, Therefore, keep

these mating surfaces clean by gently wiping with a soft cloth.

WARNING

Do not try to clean the unit using cleaners containing organic solvents such as

benzine, alcohol, acetone, ether, ketones, thinners, or gasoline. These may cause

discoloration or damage.

Make sure the probe is completely dry before reconnecting it to the oscilloscope.

N2893A Probe

N2893A 100 MHz Current Probe User’s Guide 7

Safety Information

This manual provides information and warnings essential for operating this equipment in a

safe manner and for maintaining it in safe operating condition. Before using this equipment,

be sure to carefully read the following safety notes.

WARNING

This equipment is designed according to IEC 61010-1 Safety Standards, and has been tested for

safety prior to shipment. Incorrect measurement procedures could result in injury or death, as well as

damage to the equipment. Please read this manual carefully and be sure that you understand its

contents before using the equipment. The manufacturer disclaims all responsibility for any accident or

injury except that resulting due to defect in its product.

WARNING

Do not install substitute parts or perform any unauthorized modification to the instrument. Only

Keysight service centers should perform repair/maintenance on the equipment.

DANGER

To avoid short circuits and accidents that could result in injury or death, use the N2893A probe only

with insulated power lines carrying 300V or less.

DANGER

Never use this sensor on uninsulated conductors. The core and shield case are not

insulated. Before clamping the insulated conductor being measured, make sure that the

insulation on the conductor is undamaged. Any damage to the insulation can cause an

electric shock.

WARNING

Do not subject the unit to vibrations or shocks during transport or handling. Be especially careful to

avoid dropping the unit.

WARNING

Do not store the unit where it will be exposed to direct sunlight, high temperature, high humidity, or

condensation. If exposed to such conditions, the unit may be damaged, the insulation may deteriorate,

and the unit may no longer satisfy its specifications.

WARNING

This unit is not constructed to be dustproof, so do not use it in a very dusty environment.

8 N2893A 100 MHz Current Probe User’s Guide

N2893A Probe

WARNING

The sensor head is a precision assembly including a molded component, a ferrite core, and a Hall

effect element. It may be damaged if subjected to sudden changes in ambient temperature, or

mechanical strain or shock, and therefore great care should be exercised in handling it.

WARNING

To avoid scratching the surfaces of the Hall effect elements, keep the core section of the sensor

closed, except when clamping it around the insulated conductor to be measured.

WARNING

Before turning on the instrument, you must connect the protective earth terminal of the instrument to

the protective conductor of the (mains) power cord. The mains plug shall only be inserted in a socket

outlet provided with a protective earth contact. You must not negate the protective action by using an

extension cord (power cable) without a protective conductor (grounding).

N2893A Probe

N2893A 100 MHz Current Probe User’s Guide 9

N2893A Components

Figure 1 Probe components

Opening Lever

Operating lever for opening the sensor head. Always use this lever to open the sensor head.

Sensor Head

This clamps the conductor being measured, and carries out the actual current

measurement. It is a precision assembly including a molded component, a ferrite core, and

a Hall effect element. It may be damaged if subjected to sudden changes in ambient

temperature, or mechanical strain or shock. Care should be exercised when handing the

sensor head.

Demagnetizing Switch (DEMAG)

This demagnetizes the core if it has been magnetized by switching the power on and off, or

by an excessive input. Always carry out demagnetizing before measurement. The probe

should be connected to the oscilloscope for the demagnetizing process. This process takes

about one second. During demagnetizing, a demagnetizing waveform is output. Refer to

“Demagnetization and Zero Offset" on page 14

10 N2893A 100 MHz Current Probe User’s Guide

N2893A Probe

Coarse Adjustment Trimmer

This adjustment should only be carried out if the probe offset is outside the range of the

zero adjustment dial.

NOTE

The output of this unit is terminated internally. The high-impedance such as 1 MΩinput

impedance will be automatically selected on the Infiniium oscilloscope, as the probe is

plugged into the AutoProbe interface. With an input impedance of 50Ω, accurate

measurement is not possible.

NOTE

The probe output sensitivity 0.1 V/A will be automatically selected, as the probe is

plugged into the AutoProbe interface. With a different output sensitivity, accurate

measurements are not possible.

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